Concealed hinge



FIG. 1 is a top front perspective view of a concealed hinge;

FIG. 2 is a front view of the concealed hinge;

FIG. 3 is a rear view of the concealed hinge;

FIG. 4 is a tight side view of the concealed hinge;

FIG. 5 is a left side view of the concealed hinge;

FIG. 6 is a top view of the concealed hinge; and,

FIG. 7 is a bottom view of the concealed hinge. 

CLAIM The ornamental design for a concealed hinge, as shown and described. 